Estimate Quantity in Scientific Notation

Choose TWO answer: either it does or does not AND your unit of measure

• does

• does not

• years

• hours

• minutes

Do the following operations without a calculator. Be sure to express answers in scientific notation. You may round your answers to one decimal place. (use x for multiplication and ^ to indicate exponents)

Do the following operations without a calculator. Be sure to express answers in scientific notation. You may round your answers to one decimal place. (use x for multiplication and ^ to indicate exponents)

The diameter of a speck of dust is about 0.00002 inches. Which of these is an appropriate estimate for the diameter of the speck of dust?

• 2 × 10^–5 in.

• 2 × 10^–4 in.

• 2 × 10⁵ in.

Which of the following would be a reasonable estimate for the weight of a pencil?

• 1x10^-20 lb

• 1x10² lb

• 1x10²⁰ lb

• 1x10^-2 lb

What can (2.5 x 10^8) be estimated as for easier comparison in scientific notation?

• (2 x 10^8)

• (3 x 10^8)

• (2.5 x 10^7)

• (3 x 10^9)

The diameter of the planet Mercury is approximately 3 x 10³ miles. The diameter of the planet Jupiter is approximately 30 times as large as the diameter of the planet Mercury. Which of the following is the best estimate for the diameter of Jupiter?

• 9 x 10⁵ miles

• 9 x 10⁴ miles

• 1 x 10⁴ miles

• 1 x 10⁵ miles

Rewrite the following statement using a number in scientific notation. The number of different six-character passwords that can be made with 26 capital letters, 26 lowercase letters, and 10 numerals is approximately 57 billion

A millimeter is approximately 0.00109 yards. How is this number expressed in scientific notation?

• 1.09 x 10³

• 1.09 x 10⁻³

• 1.09 x 10⁻⁴

• 1.09 x 10⁻²